<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <title>Document</title>
    <script type="text/javascript" src="../js/vue.js"></script>
    <style>
        * {
            margin-top: 20px;
        }

        .demo1 {
            height: 50px;
            background-color: skyblue;
        }

        .box1 {
            padding: 5px;
            background-color: skyblue;
        }

        .box2 {
            padding: 5px;
            background-color: orange;
        }

        .list {
            width: 200px;
            height: 200px;
            background-color: peru;
            overflow: auto;

        }

        li {
            height: 100px;

        }
    </style>

</head>

<body>

    <div id="root">
        <h2>{{name}}学习</h2>
        <!-- 阻止默认事件 -->
        <a href="https://www.baidu.com" @click.prevent="showInfo">点击提示信息</a>
        
        <!-- 阻止事件冒泡 -->
        <div class="demo1" @click="showInfo">
            <button @click.stop="showInfo">点击提示信息</button>
        </div>

        <!-- 事件只触发一次 -->
        <button @click.once="showInfo">点击提示信息</button>

        <!-- 事件的捕获模式，元素从外到内找到，事件从内到外 -->
        <div class="box1" @click.capture="showMsg(1)">
            div1
            <div class="box2" @click="showMsg(2)">
                div2
            </div>
        </div>
        
        <!-- 只有event.target是当前操作的元素才触发事件 -->
        <div class="demo1" @click.self="showInfo">
            <button @click="showInfo">点击提示信息</button>
        </div>

        <!-- 滚动条事件 -->
        <!-- <ul @scroll="demo" class="list"> -->
        <!-- 鼠标滚动事件 -->

        <!-- passive:事件的默认行为立即执行，无需等待事件回执执行完毕 -->
        <ul @wheel.passive="demo" class="list">

            <li>1</li>
            <li>2</li>
            <li>3</li>
            <li>4</li>
        </ul>



    </div>

    <script type="text/javascript">
        new Vue({
            el: "#root",
            data: {
                name: 'lyuetw'
            },
            methods: {
                showInfo(e) {
                    // 阻止默认行为 
                    // event.preventDefault()
                    // 阻止事件冒泡
                    // event.stopPropagation();
                    alert('好好学习！')
                },
                showMsg(msg) {
                    console.log(msg)
                },
                demo() {
                    for (let i = 0; i < 10000; i++) {
                        console.log('#')
                    }
                    console.log('！')
                }
            }
        })
    </script>

</body>

</html>